Spring



Dec. 14 1926. 1,610,770

, c. w. GREENE SPRING Filed A ril 5, 1924 mum auto: 11 m Patented Dec.14, 1925.

STATES inane PATENT QFFME.

CHARLES VJ. GREENE, 011 TOLEDO, OHIO, ASSIGNOB TO THE W. G. NAGELELECTRIC (30., OF TOLEDO, OHIO, A CORPORATIQN OF OHIO.

SPRING.

Application filed Aprilfi,

My invention has for its object to provide an exceedingly simple andeiiicient means for preventing the humming or vibration and noise thatmay be caused in spiral springs,

either by exterior bodies striking the springs or striking objects towhich the springs are connected, or which may occur in the use of thesprings. The invention also provides means for preventing the collectionof moisture within a helical spring. Italso provides a means whereby theelasticity of springs and their resistance to distortion may bemodified.

The invention may be contained in spiral or helical springs of anydimensions and other by the elasticity of the spring.

which may be used for any purpose. The

invention is particularly advantageous when embodied in a tensionspring. To illustrate a practical application of the invention, a springmember containing the invention 18 shown in the accompanying drawingsand is described hereinafter.

The figure of the drawings illustrates in part a side view and in part abroken view of a spring member embodying; my inven tion.

.l is a tension spring having" the usual turned ends 2 for connectingthe spring to parts that are to be drawn towards each VVithin the turnsof the wire of which the spring is formed is located a soft elastic core3 formed of sponge rubber. In the formation of the spring member, theinterior of the spring is filled with a sponge rubber composition whichis then slightly vulcanized to 1924. Serial No. 703,888.

cause it to conform to the contour of the interior of the spring. Thesponge rubber, before the vulcanization, fills all of the crevicesbetween the turns of the wire that form 0 the spring and so that when itis vulcanized, the soft rubber core will conform to the contour of theinterior of the spring. l Vhen, therefore, the spring is drawn, therubber will stretch to the same extent throughout 4 its length; sincethe wire will lie in a channel .4 that is formed in the surface of thecore when it is vulcanized. The channel 4rspirulates the exterior of thecore and conforms to the shape of the inner half of the 5 wire of whichthe spring is formed.

Inasmuch as the entire interior of the spring is filled with a softrubber core it will reduce or d'eaden any noise that might be producedby striking the spring, and elim 55 inate any vibration that might be ofa sympathetic nature or that might be produced by striking the springorv parts to which the spring is connected. I

I claim In a spring member, a close coiled helical spring having a softsponge'rubber core conforming to the contour of the interior of thespring and vulcanized thereto. said core reducing or, deadening noiseand eliminating vibration of sympathetic nature or that might beproduced by striking the spring or parts to which the spring isconnected.

In testimony whereof, I have hereunto signed my name to thisspecification.

CHARLES GR-El lNlG.

